@article{DE_1999_35_1_a14,
     author = {E. K. Makarov and S. N. Popova},
     title = {On the global controllability of a complete set of {Lyapunov} invariants of two-dimensional linear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {97--106},
     publisher = {mathdoc},
     volume = {35},
     number = {1},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_1_a14/}
}